I've never used that format. I've used 14mm sub miniature (I think it was 14mm, but it might have been 10mm), 35mm, 120, 620, 5x4 and one size/type of Polaroid. In the grand (film) scheme of things, that leaves most formats untouched.

The S in APS stands for "system"; nevertheless, APS is mainly a format as far as the general user is concerned. APS was film's last hurrah in the casual photographer's market before digital photography took over almost completely. Although serious photographers who use APS cameras and film may be out there in small numbers, I haven't heard of any, nor can I imagine a nonhistorical motivation for a serious photographer to use the format. The negative size approximates that of a "crop" dSLR's imager, hence the quality issues of film would be that much greater than the more readily home-processed 35 mm film.

The advantages of this format were mainly for the manufacturer, which could charge more for the special handling. In fact, the one and only roll of APS film I have ever exposed was in a one-time-use camera and the cost of each exposure, including the film, processing, and printing, was worked out to about one U.S. dollar per exposure, win, lose, or draw. It was that experience that caused my wife to stop kvetching about my digital cameras and to understand that digital really was a cheaper cost-to-own alternative to film despite the price of digital equipment back then.

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